Tracker-board.



G. L. DAVISL TRACKER BOARD.

APPLICATION FILED JAN. 6, 1910.

998,877. Patented July 25,1911.

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UNITED STATES PATENT OFFICE.

CHARLES L. DAVIS, OF DETROIT, MICHIGAN.

TRACKER-BOARD.

Application filed January 6, 1310.

To all whom it may concern:

Be it known that I, CHARLES L. DAVIS, a

citizen of the United States, residing at Detroit, county of \Vayne,State of Michigan, have invented a certain new and useful Improvement inTracker-Boards, and declare the following to be a full, clear, and exactdescription of the same, such as will enable others skilled in the artto which it pertains to make and use the same, reference being had tothe accompanying drawings, which form a part of this specification.

This invention relates to pneumatic actuated machines of that characterin which a tracker board is used in connection with a perforated sheetof paper as the valve structure which controls the inlet of the primaryair that inaugurates the movement of the mechanism.

It has for its object a tracker board provided with one or more openingsof extra large size or capacity, which large openings act in conjunctionwith the perforations in the sheetof paper to produce a long-con tinnedflow of air, instead of the intermittent flow of air which occurs withthe use of the ordinary perforated sheet and the ordinary tracker board.

In the drawings :Figure 1, is a front elevation of the tracker board,and a portion of the perforated sheet of paper. Fig. 2, is a diagramindicating the position of the paper over the tracker board with a holethrough the paper central over a large opening through the trackerboard. Fig.3,is a diagram showing the paper with the hole in the trackerboard centrally disposed, or nearly centrally disposed, between twoholes, both of which are overlapped. Fig. 4, is a diagram showing theperforated paper quite similarly located with respect to the hole in thetracker board to the position shown in Fig. 3, except that the second orlowermost perforation is shown as just entering its position of registrywith the tracker board hole. Fig. 5, shows the paper in the sameposition as Fig. 2, except that it is one full step behind the positionthere shown.

In the use of perforated sheets with tracker boards of ordinaryconstruction to produce a long-continued flow of air, as is sometimesnecessary, it has been found necessary to punch or cut the holes in theform of a long slot, continuous in length to an extent sufficient toproduce the desired length of flow of air. This weakens theSpecification of Letters Patent.

Patented July 25, 1911.

Serial No. 536,697.

paper valve member along the line of the holes, especially if the lineof holes is near the edge of the paper, is frequently, if not usually,the case, and this part of the paper is apt to get out of its propertrack and either tear the paper or catch and clog. To overcome this, Imake a tracker board I, which has the openings of the usual sizeextending almost completely thereacross, and with a large opening 2,which extends across the tracker board along the line from a to b for adistance greater than the distance between two consecutive holes 3 and aon the paper valve member. The extent of the holes of the tracker boardshould be sufficientto enable the paper, when traveling over the hole 2,to bring the hole l into engagement therewith before the hole 3 hasentirely left its engagement with the hole 2 in the tracker board. Nhenso constructed, the continuity of the paper of the valve member is notbroken through a longer extent than the diameter of the single hole, butits effective action is the same as though there was a continuous slotextending through the entire length of the paper where the consecutiveholes are punched closely enough together to produce the desired result.

This form of tracker board is particularly useful in machines that areemployed to actuate typewriters for the purpose of actuating what may becalled the tabulating part of the typewriter, including, of course, theinsets at the beginning of paragraphs, blank spaces in lines, andsimilar places where it is desired to repeat the actuation of the spacera large number of times. It is also useful in musical instruments foractuating pedals and other parts of the instrument. The desired gagingand timing for each musical selection can be effected by proper relativespacing of the small holes in the paper.

What I claim as new is 1. In combination with a perforated valve sheet,a tracker board having a plurality of air inlet openings of varyinglength spaced therealong, the smaller openings emg adapted to be spannedby individual perforations of uniform size in the traveling paper valvemember, and to be entirely covered by the unperforated portion of thesheet between the occurrence of the perforations, and the larger openingbeing adapted to maintain registry with one of the perforations in thepaper valve member, by its eX- tent along the path of travel thereof,until a succeeding perforation of the same noteprodueing value has comeinto registry with it, thereby maintaining a continuous llow 0t airtherethrough for he desired period of time, substantially as described.

in combination with a tracker board having a plurality of holes ofvarying length, a traveling perforated sheet adapted to travelthereover, and, by the registry of its perforated portions With thelonger or said holes, to permit the continuous passage of air blaststherethrough, some portion of the length of each of said holes beingadapted to maintain registry with one of a. repeated series ofperforathms ot the same note value until a succeeding perforation hasmoved into registry therewith, substantially as described.

In testimony whereof, I sign this specification in the presence of twowitnesses.

CHARLES L. DrrVlS.

itnesses (lrranmcs i Burrow, Vmo'mm C. tirim'r'r.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner or" latents, Washington, D. C.

